CO_2和地层水、储层配伍性实验研究  

COMPATIBILITY STUDY OF CO_2 WITH FORMATION WATER AND RESERVOIR

作　　者：李苗[1] 郭平[1] 易敏[1] 孙良田[1] 

机构地区：[1]"油气藏地质及开发工程"国家重点实验室.西南石油大学,四川成都610500

出　　处：《西南石油大学学报（自然科学版）》2009年第1期98-102,共5页Journal of Southwest Petroleum University(Science & Technology Edition)

摘　　要：针对CO2驱油方法在近年来得到人们的广泛重视,它在国内尤其在国外应用广泛,取得了良好的驱油效果的实际,研究了注CO2采油过程中,当CO2到达储层后,与地层原油、地层水以及储层岩石相互接触,发生一些物理化学性质的变化,使得储层的渗透能力也发生变化的问题。利用中原油田提供的地层水及储层岩石样品进行了CO2和地层水、储层配伍性的实验研究。测试了注CO2前后岩芯水测渗透率的变化情况,并进行了原因分析。实验结果表明:注CO2过程中不会产生碳酸钙沉淀堵塞孔道降低储层渗透率;相反由于CO2溶解于水中生成碳酸溶蚀了岩石的某些胶结物,使岩石渗透率得到改善。CO2 flooding attracts extesive attention in recent years,it is widely used both home,especially abroad,and good effectiveness is achieved.It is studied that in the process of oil recovery by CO2 injection,when CO2 gets into reservoirs,the change in physical and chemical properties occures duo to the contact between CO2 and crude oil,formation water and reservoir rocks,which makes reservoir permeability change.The compatibility study of CO2,formation water and reservoir is conducted by using the samples of formation water in core permeability before and after CO2 injection is tested,and the reason is analyzed.Result indicates that,in the process of CO2 injection,no calcium carbonate precipitates to plug pore space as to decrease permeability,on the contrary,permeability is improved because CO2 dissolves in water to form carbonic acid,which dissolves some cement of the rocks.

关 键 词：CO2 地层水 渗透率 配伍性 碳酸钙沉淀 

分 类 号：TE327[石油与天然气工程—油气田开发工程]